1) From Levitz return to the series, cica LSH v2 270-something through Great Darkness and about halfway into Omen & Prophet)
2) Levitz first run on the series from Superboy & LSH #220-somthing through Earthwar)
3) The late Adventure run from #340-380.
4) The reboot up to right near the end of the Emerald Vi story.
5) Threeboot, before and after Lemnos.
6) Various early stories and Adventure up to #339.
7) Pre-Levitz Superboy, Superboy & LSH
8) Late Superboy & LSH through early LSH v.2
9) v.3 up through Crisis
10) Post Crisis to 5-year gap